APA (7th ed.) Citation

Ravallion, M. (2012). The developing world's bulging (but vulnerable) "middle class".

Chicago Style (17th ed.) Citation

Ravallion, Martin. The Developing World's Bulging (but Vulnerable) "Middle Class". 2012.

MLA (8th ed.) Citation

Ravallion, Martin. The Developing World's Bulging (but Vulnerable) "Middle Class". 2012.

Warning: These citations may not always be 100% accurate.